Improvement in machines for forming gear-wheel molds



Q -1. CLAYTON. 'Machine for Forming Gear Whe eI Molds.

N0. 161,385. Patented March 30,1875.

III

WITNESSES QQ MK/ THE GRAPHIC CO.PHOTO.-LITH.39&41 PARK PLAGEJLY.

NITED TATES JAMES CLAYTON, OF PORTSMOUTH, OHIO.

IMPROVEMENT IN MACHINES FOR FORMING GEAR-WHEEL MOLDS.

Specification forming part of Letters Patent No. 161,385, dated March 30, 1875; application filed June 13, 1874.

To all whom it may concern:

Be it known that I, JAMES CLAYTON, of Portsmouth, in the county of Scioto and State of Ohio, have invented a new Improved Machine for Forming Gear Wheel Molds, of which the following is a specification:

In the accompanying drawing, Figure 1 represents a vertical central section on the line 0 c, Fig. 2, of my improved machine for forming gear-wheel molds, and Fig. 2 represents a top view of the same.

Similar letters of reference indicate corresponding parts.

The invention will first be fully described, and then pointed out in the claim.

In the drawing, A represents the bed of my machine for forming the molds for gear-wheel teeth, which is provided with a circumferential fiange-rin g, A, in which the wheel is molded. A vertical shaft, B, turns in a central socket-hole, a, of the molding-bed, and carries the vertically-adjustable cross-head O, which supports again, in its horizontal sleeveshaped ends b, the parallel guide-arms D fasteued by clamp-screws b. The end of one guide-arm, D, carries the stop-piece D, which serves, in connection with slot-ted marker E, to define the exact position of the molding pattern. The marker E is adjusted on the flange-ring A by a set-screw, d, after the outside of the ring has been divided into as many .parts as teeth are required in the wheel to be molded. The lower part of stop-piece D is of curved shape to slide accurately along the flange-rin g, and is fastened firmly thereto, after being carried against the marker E by a set-screw, e, to give the requisite stability to the supporting devices. Guide-arms D carry a second adjustable cross-head, F, which slides thereon in similar manner by sleeve-shaped ends, and is clamped by suitable set-screws at the distance from the center shaft required by the radius of the wheel. Cross-head F carries centrally to it the vertical slide-standard G, in whose central grooved part the slide G, with the tooth-pattern attached thereto, is raised and lowered by a screw-bolt, f, and handle f. The tooth pattern Gr consists of two semi-teeth, and intermediaterecess of the exact size of the teeth required, and is applied in such a manner to the slide G that the radial and accurate position of the teeth is obtained in the mold.

The mode of forming the mold is as follows: The bottom is first formed bya mold-board on the bed of the machine, the marker is then placed on the outer division of the flange-ring, and the guide-arms firmly fixed thereon. The tooth-pattern is then lowered, and the sand firmly rammed in between it and the flangering. The pattern is {then raised, and the marker and guide-arms adjusted for the next tooth, and the space rammed with sand, as before. This operation is confined until all the teeth of the geanwheel are molded.

Wheels of difierent diameters may be molded as the guide-arms and the pattern-supporting cross-head are adjustable. The core-box for the arms and center part of the Wheel is then inserted, and the top formed by mold-board. The divisions on the flange-ring may be either permanently or temporarily applied, as preferred, requiringin the latter case the markin g on a varnish or other covering.

All the various kinds of gear-wheels may be molded in this machine in a very expeditious and accurate manner.

Having thus described my invention, what I claim as new, and'desire to secure by Letters Patent, is-- The combination, in a gear-wheel-molding machine with a vertical circular bed-flange, A, of the stop-piece D, on guide-arm and the marker E, both adjustable on same flange, as and for the purpose set forth.

JAMES CLAYTON. Witnesses:

W. O. LoYD, THos. S. HALL. 

